package 牛客.堆栈队列;

import java.util.Stack;

public class BM42用两个栈实现队列 {
    Stack<Integer> stack1 = new Stack<Integer>();//用来入栈
    Stack<Integer> stack2 = new Stack<Integer>();

    public void push(int node) {
        stack1.push(node);
    }

    public int pop() {
        while (!stack1.isEmpty()) {
            stack2.push(stack1.pop());
        }
        int pop=stack2.pop();
        while (!stack2.isEmpty()) {
            stack1.push(stack2.pop());
        }
        return pop;
    }
}
